Charged particles may be attenuated by losing energy to reactions with electrons in the barrier, while x-ray and gamma radiation are attenuated through photoemission, scattering, or pair production. Just plug in the power cord, flip the toggle switch to “ON”, then This will certainly come in handy if you don’t want to fly your bird too close to a tower. Electrical Switchgear is consider as low voltage Switchgear if it is rated upto (a) 400 V. (b) 1 kV. (c) quenching arc. Answer            B, 8. 3. The invention also discloses a process for producing the thermal barrier coating. This sort of shielding is impractical for protecting signal cables from inductive coupling, as mumetal is rather expensive and must be layered relatively thick in order to provide a sufficiently low-reluctance path to shunt most of the external magnetic flux lines. Which is not identical for an atom and an isotope, Q6. The commonly used material for shielding is, Q18. 24. Shielding gases are inert or semi-inert gases that are commonly used in several welding processes, most notably gas metal arc welding and gas tungsten arc welding (GMAW and GTAW, more popularly known as MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas), respectively). Practice MCQs For Thermal Physics. This paper reviews the potential of polymer and ceramic matrix composites for aerospace/space vehicle applications. On top of thermal imaging capabilities, the camera of the Mavic 2 Enterprise also has 2x optical zoom and 3x digital zoom. The energy required to be applied to a radioactive nucleus for the emission of a neutron is. (b) at the receiving end. For reasons of economy, weldability, strength, and resistance to corrosion, flanges are usually made of the same material as the enclosure. Shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. What is the function of a choke in tube light? The mass number of a substance represents the sum of total number of, Q5. Isotopes of same elements have (a) same atomic number and different masses Generally, the circuit breakers are rated  term of (a) volt-ampere. The reasons for paralleling are; A single alternator may not meet the local or regional power requirements. Heating elements made of Kanthal can be used for continuous operation at a temperature up to 1400 o C. Start studying MCQ 7&8&9. (d) anywhere in the line. Answer            C, 13. (b) all phase to earth. the neutron shielding system for Fluoride-Salt Cooled High Temperature Reactors (FHRs). Save my name, email, and website in this browser for the next time I comment. ineffective shielding. Multiple Choice Questions and Answers on Optical Fiber Communication(Part-1) ... which among the following reasons is/are responsible for an extrinsic absorption? This allows for thermal imagery to be overlapped with optical imagery, allowing for better identification of thermal anomalies. 3.4. It is possible to shut down one or more alternators for scheduled or emergency maintenance when the alternators are operating in … Exterior rows of buildings in closely arranged groups (towns) shield buildings in the interior. Providing sufficient shielding gases. asked by adminWhy Motor rated in kW instead of kVA? Answer            A, 11. (a) Differential relay. (c) voltage. The cube is heated by a 100 watt light bulb. In the electric system, Resonance may result in (a) zero voltage. The most commonly used moderator in nuclear plants is, Q11. This electrical insulating layer of aluminum make the heating element shock proof. c) Graphite or cadmium. The metal layer is formed on a dielectric polymer substrate with interposition of a corresponding portion of an intermediate layer (2). Reasons for Paralleling of Alternators. examveda.com is a portal which provide MCQ Questions for all competitive examination such as GK mcq question, competitive english mcq question, arithmetic aptitude mcq question, Data Intpretation, C and Java programing, Reasoning aptitude questions and answers with easy explanations. The agency and its partners are developing, testing, and maturing critical components of various propulsion technologies to reduce the risk of the first human mission to Mars. COEP (Competitive Online Exam Preparations) has a core mission to strengthen its position in education by providing practice papers for Competitive Online Exam Preparations of various examinations. 14) The main reason for using high voltage for long distance power transmission is a) Reduction in transmission losses b) Reduction in time of transmission If the interior contained matter which is not of the same density everywhere, then on the surface of the earth, the acceleration due to gravity Radiation shieldingis based on the principle of attenuation, which is the ability to reduce a wave’s or ray’s effect by blocking or bouncing particles through a barrier material. A shielded cable that is not grounded does not work effectively. a) X-rays. When unwanted electromagnetic energy radiates in space or down I/O and power cables, we call this EMI. More so, good ventilation for the mobile home skirting is a must. A shielded building is best. asked by Guma. (d) Any of the above. (b) failure of field. Power cables are mainly used for power transmission and distribution purposes. 10. In electrical engineering, electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. In a previous article 1 we talked about the basics of electromagnetic compatibility (EMC) shielding. The thermal conductivity of a shielding gas affects its ability to transfer heat across the arc. Arcing voltage will be the least in case of (a) carbon. (d) none of the above. (c) IDMT relay. 4.4 For the reasons stated above, the subject-matter of claim 10 of auxiliary requests 2, 3 and 4 extends beyond the content of the application as originally filed and the requirement of Article 123(2) EPC is thus not fulfilled. (c) stator winding fault. The “base first” decision: crew survival and reusability by John K. Strickland, Jr. Monday, January 15, 2007. Redesigning the joint so as to permit sufficient space for proper manipulation of the puddle of molten weld metals. For these reasons … (c) circuit breaker. For which of the following alternators, the distribution factor will be 0.96? Thermal Properties of Matter MCQ 1: Aluminum has the specific heat capacity of A. This article continues where that article left off and provides more insight into how shielding is used in product development, in particular the effectiveness of shielding when it is applied at the PCB level. Answer            C, 4. d) Neutrons and gamma rays . Your email address will not be published. (b) Impedance relay. Moderator in nuclear plants is used to, d) Cause collision with the fast moving neutrons to reduce their speed, Q9. (d) unbalanced loading. a. ASUS is known for providing the best of the best quality products. This temperature, called the transition temperature, varies for different materials but generally is below 20 K (−253 °C). Aqueous based sodium silicate Master Bond MB600S offers high thermal stability, good shielding effectiveness, non-flammability, and is easy to apply. (d) tungsten. Radiation Shielding Design and Selection Considerations. The use of superconductors in inert shielding gas. Welders had been using shielding gases to protect their work since the 1920s, but when World War II began, these gases went from a niche practice to a commercial standard. (b) high voltage. The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is, a) Same atomic number and different masses, b) Same chemical properties but different atomic numbers, c) Different masses and different atomic numbers, d) Different chemical properties and same atomic numbers, Q3. The cloth shroud from around a mummy is found to have a 14 C activity of 8.9 disintegrations per minute per gram of carbon as compared with living organisms that undergo15.2 disintegrations per minute per gram of carbon. 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